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51/8-15/8=c

We move all terms to the left:

51/8-15/8-(c)=0

We add all the numbers together, and all the variables

-1c+51/8-15/8=0

We multiply all the terms by the denominator

-1c*8+51-15=0

We add all the numbers together, and all the variables

-1c*8+36=0

Wy multiply elements

-8c+36=0

We move all terms containing c to the left, all other terms to the right

-8c=-36

c=-36/-8

c=4+1/2

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